Sumitomo Electric Industries, Limited

Sumitomo Wiring Systems, Limited

Autonetworks Technologies, Limited

Hiroyuki Tsukamoto

Shogo Kamiguchi

Keigo Yoshida

The detection device that detects presence of an unauthorized message in an in-vehicle network, the detection device includes: a state detection unit configured to detect a transition to a state in which a periodic message is transmitted in an in-vehicle network, based on content of a message transmitted in the in-vehicle network; and a processing unit configured to perform detection processing to detect presence of the unauthorized message based on a reception status of a plurality of the periodic messages in the state detected by the state detection unit.

Detection device, detection method and detection program

A detection device includes: a monitoring unit configured to monitor a periodic message and an event message as messages in an in-vehicle network, each message having, assigned thereto, identification information of a transmission source and a sequence number; a counter unit configured to change a counter value corresponding to the identification information, when the detection device has received the event message from the in-vehicle network; and a detection unit configured to compare the sequence number with the counter value, based on a result of monitoring, and perform provisional determination for detection of an unauthorized message, based on a result of the comparison. The detection unit performs conclusive determination for detection of the unauthorized message, based on an interval of messages that satisfy a predetermined condition regarding the sequence number, among messages to which the same identification information is assigned, and on a predetermined transmission cycle of the periodic message.

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Osaka, Japan

Hiroyuki Tsukamoto